Playing Audio from Video Podcast/Movie while "Sleeping..."

I don't know if this has been discussed before, but I just found this a few minutes ago...

Let me start off with a question...

Have you ever wanted to listen to audio only from a podcast/movie that you have on your iPod? Logically, the video player should continue to play the audio even after you press the sleep button, but sadly it doesn't...

I'm not sure if this is "common knowledge" so if anybody wants to know how to do this, reply to this thread and I will just edit this with instructions...